linux-kernel - Re: [PATCH net] net: fec: avoid lock evasion when reading pps

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Date: Mon, 13 May 2024 20:56:49 +0100
From: Simon Horman <horms@...nel.org>
To: Wei Fang <wei.fang@....com>
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, shenwei.wang@....com, xiaoning.wang@....com,
	richardcochran@...il.com, andrew@...n.ch, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, imx@...ts.linux.dev
Subject: Re: [PATCH net] net: fec: avoid lock evasion when reading pps_enable

On Mon, May 13, 2024 at 08:54:59PM +0100, Simon Horman wrote:
> On Mon, May 13, 2024 at 09:51:26AM +0800, Wei Fang wrote:
> > The assignment of pps_enable is protected by tmreg_lock, but the read
> > operation of pps_enable is not. So the Coverity tool reports a lock
> > evasion warning which may cause data race to occur when running in a
> > multithread environment. Although this issue is almost impossible to
> > occur, we'd better fix it, at least it seems more logically reasonable,
> > and it also prevents Coverity from continuing to issue warnings.
> > 
> > Fixes: 278d24047891 ("net: fec: ptp: Enable PPS output based on ptp clock")
> > Signed-off-by: Wei Fang <wei.fang@....com>
> 
> Reviewed-by: Simon Horman <horms@...nel.org>

Sorry, I convinced myself this is correct.
But I now see that questions have been raised by others.
So please ignore the above.